Here is the Grada ceiling diffusers with perforated inlay! These diffusers can be used for both supply and extract. The diffusers have a nominal length and width of 594mm and are therefore suitable for a 600x00 suspended ceiling. The perforated ceiling diffusers have a panel perforation of approximately 51% and are made of steel. Still looking for another diffuser? Then take a look at our full range of ventilation grilles!